Page to correct GT: http://www.bungie.net/Stats/Reach/Default.aspx?player=Iration alFear00&sg=0
Splitscreen lag. It's minimal on H3, but it's a significant hinderance on half of Reach's maps. If you want to use Halo MM with a friend in the same room, H3 will not have this problem, and by that train of thought, it is the better choice.